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You searched for: subject:"What -- SOHO"
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[image]SPD-SOHO-eit027 - NASA/Solar & Heliospheric Observatory
SOHO-EIT image from 14 September 1997 showing a huge eruptive prominence in the resonance line of singly ionized helium (He II) at 304 Angstroms in the extreme ultraviolet. The material in the eruptive prominence is at temperatures of 60,000 - 80,000 K, much cooler than the surrounding corona, which is typically at temperatures above 1 million K.
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-eit001 - NASA/Solar & Heliospheric Observatory
Twisting prominence. An EIT 304Å image of a large, twirling prominence taken on Jan. 18, 2000. Prominences are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can erupt, escaping the Sun's atmosphere.
Keywords: What -- SOHO
Downloads: 7
[image]SPD-SOHO-lasco007 - NASA/Solar & Heliospheric Observatory
LASCO C2 image of coronal streamers and a filament eruption taken on 21 August 96. In this picture of the normal K-corona (or electron corona, seen by the eye at eclipses), we see bright streamers on the east (left) limb, which are extensions of the faint, stream-like features seen in the C1 images. On the west (right) limb, the equatorial 'streamer,' quite usual at this time in the sunspot cycle, has brightened suddenly, with outward-gushing plasma, while above the horizontal streamer, a twiste...
Keywords: What -- SOHO
Downloads: 7
[image]SPD-SOHO-las007 - NASA/Solar & Heliospheric Observatory
LASCO C2 image taken at 23:01 hours UT on 21 Aug 96. In this picture of the normal K-corona (or electron corona, seen by the eye at eclipses), we see bright streamers on the east (left) limb, which are extensions of the faint, streamlike features seen in the C1 images. On the west (right) limb, the equatorial 'streamer,' quite usual at this time in the sunspot cycle, has brightened suddenly, with outwardgushing plasma, while above the horizontal streamer, a twisted mass of ionized gas, expelled ...
Keywords: What -- SOHO
Downloads: 7
[image]SPD-SOHO-eitplume - NASA/Solar & Heliospheric Observatory
EIT 304Å image captures a sweeping prominence -- Prominences are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can erupt, escaping the Sun's atmosphere. Emission in this spectral line shows the upper chromosphere at a temperature of about 60,000 degrees K. Every feature in the image traces magnetic field structure. The hottest areas appear almost white, while the darker red areas indicate cooler temperatures.
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-eit304cme1 - NASA/Solar & Heliospheric Observatory
No caption.
Keywords: What -- SOHO
Downloads: 4
[image]SPD-SOHO-swa002 - NASA/Solar & Heliospheric Observatory
SWAN Lyman?alpha full sky reduction factor (in ecliptic coordinates).
Keywords: What -- SOHO
Downloads: 8
[image]SPD-SOHO-eit004 - NASA/Solar & Heliospheric Observatory
Joseph B. Gurman Normal Joseph B. Gurman 1 2001-02-05T16:41:00Z 2001-02-05T16:43:00Z 1 45 259 NASA GSGC 2 1 318 9.2511 800x600 0 0 One hour of a coronal mass ejection on Feb. 26-27, 2000 taken by EIT 195_Ö. A CME blasts into space a billion tons of particles travelling millions of miles an hour.¬¨Ä This particular¬¨Ä CME led to the "lightbulb- shaped" images seen by LASCO's C2 and C3 instruments on Feb...
Keywords: What -- SOHO
Downloads: 7
[image]SPD-SOHO-eit5prom - NASA/Solar & Heliospheric Observatory
Bulbous prominence -- An EIT 304Å image of a large, twirling prominence taken on February 12, 2001 Bulbous prominence -- An EIT 304Å image of a large, twirling prominence taken on February 12, 2001. Prominences are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can extend outward and break away from the Sun's atmosphere. This image shows ions of helium heated at 60,000 degrees C.
Keywords: What -- SOHO
Downloads: 7
[image]SPD-SOHO-cds023 - NASA/Solar & Heliospheric Observatory
The images were derived from full disk scans by CDS on 23 April 1998. As the temperature increases, the radiation comes from higher layers of the solar atmosphere, or corona, and is more strongly associated with solar activity. At the very highest temperatures, only the hot loops above active regions are visible. Scientists use images like these to probe the temperature structure of the solar atmosphere.
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-mdi006 - NASA/Solar & Heliospheric Observatory
MDI Partial High Resolution Dopplergram Minus Polynominal Fit This image is a portion of a MDI highresolution dopplergram and shows about 4% of the solar disk. The largescale rotation signature has been removed to clarify the smallerscale surface motions.
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-ern010 - NASA/Solar & Heliospheric Observatory
ERNE/HED measurements of a ring-like anisotropy of 16-20 MeV protons accelerated by an IP-shock on 11 August 2000. The instrument's angular resolution enables it to see far more accurate directional intensity distributions than any other particle instrument in this energy scale. To the area outside the HED viewcone (marked with a semi-circular boundary) an estimate of the distribution is drawn, based on the high resolution pitch-angle distribution measured by the instrument.
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-las020 - NASA/Solar & Heliospheric Observatory
LASCO C3 image of the large coronal mass ejection (CME) of 29 March 1998.
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-mdi019 - NASA/Solar & Heliospheric Observatory
MDI high resolution magnetogram overlaid with lines of convergence of the horizontal flow and with green dots showing the convergence points. The measured flow is shown as colored arrows, red for inferred downflow and blue for inferred upflow. The field is shown light grey for positive fields and dark for negative fields. Only field above the background noise is shown.
Keywords: What -- SOHO
Downloads: 8
[image]SPD-SOHO-mdi003 - NASA/Solar & Heliospheric Observatory
MDI 45 Image Average Dopplergram Minus Polynominal Fit Subtracting the average solar rotation signal from a 45 image average of full disk dopplergrams enhances the surface motions associated with solar convection. Convective flow transports material and energy from the Sun's interior along narrow plumes. At the surface, the upwelling material then spreads out horizontally in the granulation pattern seen in this image...
Keywords: What -- SOHO
Downloads: 8
[image]SPD-SOHO-cutaway00 - NASA/Solar & Heliospheric Observatory
Cutaway - The three major zones of the Sun's internal structure are shown in this cutaway of an EIT 304 image. The core (temperature of 15 million degrees) is where the nuclear fusion occurs. In the large radiative zone the plasma and energy are gradually moved outwards from the core over a period of thousands of years. Finally, the hot plasma is cycled through a convection process (represented by the series of circles) in the convection zone up to the surface and out into space.
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-spotcloseinset - NASA/Solar & Heliospheric Observatory
Huge sunspot group -- Active region 9393 as seen by MDI hosted the largest sunspot group observed so far during the current sol Joseph B. Gurman Normal Joseph B. Gurman 1 0 2001-04-11T18:27:00Z 2001-04-11T18:27:00Z 1 NASA GSGC 1 1 9.2511 800x600 0 0 Huge sunspot group -- Active region 9393 as seen by MDI hosted the largest sunspot group observed so far during the current solar cycle. On 30 March 2001, the sunspot area within the group spanned an area more than 13 times the entire surface of the ...
Keywords: What -- SOHO
Downloads: 8
[image]SPD-SOHO-suncombo1 - NASA/Solar & Heliospheric Observatory
Blasting CME -- This LASCO C2 image, taken 8 January 2002, shows a widely spreading coronal mass ejection (CME) shooting billi Joseph B. Gurman Normal Joseph B. Gurman 2 2003-04-07T19:50:00Z 2003-04-07T19:50:00Z 1 NASA GSGC 1 1 9.2511 800x600 0 0 Blasting CME -- ¬¨ÄThis LASCO C2 image, taken 8 January 2002, shows a widely spreading coronal mass ejection (CME) as it blasts more than a billion tons of matter out into space at millions of kilometers per hour.¬¨Ä The C2 image was turned 90 deg...
Keywords: What -- SOHO
Downloads: 8
[image]SPD-SOHO-swa003 - NASA/Solar & Heliospheric Observatory
With the help of an absorption Hydrogen cell, SWAN can also provide a measurement of the radial velocity of H atoms with respect to SOHO. This image can therefore be interpreted as a "Dopplergramme" of the H Lyman-alpha interplanetary emission. The radial velocity is zero where the effect of the absorption cell is maximum (minimum value of the Reduction factor which is the ratio of the Lyman-alpha intensity when the H cell is ON to the intensity when the H cell is OFF)...
Keywords: What -- SOHO
Downloads: 8
[image]SPD-SOHO-eitdiffcme - NASA/Solar & Heliospheric Observatory
EIT observation of a Moreton wave expanding across much of the Sun?s surface. The wave was promulgated by a coronal mass ejection (CME) initiation site on 12 May 1997. This "running difference" imaging technique emphasizes the changes between successive frames. The wave front travels at speeds of about 300 km/s. These images were formed in the emission lines of Fe XII near 195 Ôø_ ? this ion is formed at temperatures of about 1.5 million degrees.
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-eitcolor5 - NASA/Solar & Heliospheric Observatory
EIT 304Å image details many solar features and some elongated prominences -- Prominences are huge clouds of relatively cool den EIT 304Ôø_ image details many solar features and some elongated prominences -- Prominences are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. Emission in this spectral line shows the upper chromosphere at a temperature of about 60,000 degrees K...
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-eit024 - NASA/Solar & Heliospheric Observatory
A time series of SOHO-EIT images showing the development of a huge, eruptive prominence on 1997 August 27. The images were obtained with EIT's unique, normal-incidence, multilayer-coated telescope in the resonance line of singly ionized helium (He II) at 304 Angstroms in the extreme ultraviolet. The material in the eruptive prominence is at temperatures of 60,000 - 80,000 K, much cooler than surrounding corona, which is typically at temperatures above 1 million K...
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-eit029 - NASA/Solar & Heliospheric Observatory
SOHO-EIT image in resonance lines of eleven times ionized iron (Fe XII) at 195 Angstroms in the extreme ultraviolet showing the solar corona at a temperature of about 1 million K. This image was recorded on 11 September 1997. It is dominated by two large active region systems, composed of numerous magnetic loops.
Keywords: What -- SOHO
Downloads: 7
[image]SPD-SOHO-whip304 - NASA/Solar & Heliospheric Observatory
A long whip-like eruptive prominence is captured in this EIT 304Ôø_ image on 30 July 2002. Although one end of the prominence is still attached to the Sun, it probably broke away soon after the image was taken--it was gone in the next image 6 hours later. Prominences are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can erupt, escaping the Sun's atmosphere...
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-ern011 - NASA/Solar & Heliospheric Observatory
ERNE/HED measurements of an "interplanetary highway" for 17-22 MeV protons. The particles were accelerated by a major flare on 2 May 1998. To the area outside the HED the viewcone (marked with a semi-circular boundary) an estimate of the distribution is drawn, based on the high resolution pitch-angle distribution measured by the instrument.
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-171loops - NASA/Solar & Heliospheric Observatory
Active regions and magnetic loops as recorded by EIT in the Fe IX/X 171Ôø_ line. The temperature of this material is about 1 million K in the lower corona.
Keywords: What -- SOHO
Downloads: 9
[image]SPD-SOHO-eit002 - NASA/Solar & Heliospheric Observatory
An EIT 304Å image captures a pair of curving erupting prominences on 28 June 2000 -- Prominences are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can erupt, escaping the Sun's atmosphere. Emission in this spectral line shows the upper chromosphere at a temperature of about 60,000 degrees K. Every feature in the image traces magnetic field structure...
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-las02 - NASA/Solar & Heliospheric Observatory
"Lightbulb" CME. A coronal mass ejection on Feb. 27, 2000 taken by LASCO C2 and C3. A CME blasts into space a billion tons of particles travelling millions of miles an hour. This particular CME is "lightbulb- shaped" and is featured on our "Hot Shots" page.
Keywords: What -- SOHO
Downloads: 8
[image]SPD-SOHO-superprom - NASA/Solar & Heliospheric Observatory
EIT 304Å image of a huge, handle-shaped prominence taken on Sept. 14, 1999 -- Prominences are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can erupt, escaping the Sun's atmosphere. Emission in this spectral line shows the upper chromosphere at a temperature of about 60,000 degrees K. Every feature in the image traces magnetic field structure. The hottest areas appear almost white, while the darker red areas indicate cooler temperatures.
Keywords: What -- SOHO
Downloads: 7
[image]SPD-SOHO-12jul2007 - NASA/Solar & Heliospheric Observatory
Over a four-day period (July 7-11, 2007) of watching the Sun's atmosphere with SOHO's C2 coronagraph, we observed a sputtering outflow of particles from an active region. Although none of the distinct outbursts were particulary strong, at least six to eight clouds of particles were thrust into space. The rest of the time was generally marked by recurrent flows or a streaming of charged particles. That active region has since lost much of its energy and is much quieter than it was...
Keywords: What -- SOHO
Downloads: 8
[image]SPD-SOHO-sunspot00 - NASA/Solar & Heliospheric Observatory
Large sunspot group -- Active region 9169 was the host of the largest sunspot group observed so far during the current solar cy Joseph B. Gurman Normal Joseph B. Gurman 1 2001-02-02T20:26:00Z 2001-02-02T20:32:00Z 1 75 428 NASA GSGC 3 1 525 9.2511 800x600 0 0 Large sunspot group -- Active region 9169 was the host of the largest sunspot group observed so far during the current solar cycle. On 23 September 2000, the sunspot area within the group spanned 2,140 millionths of the visible solar surface...
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-20020227eit171looprt - NASA/Solar & Heliospheric Observatory
Joseph B. Gurman Normal Joseph B. Gurman 1 0 2002-02-27T15:45:00Z 2002-02-27T15:45:00Z 1 54 313 NASA GSGC 2 1 384 9.2511 800x600 150 0 0 Large magnetic loop as recorded by EIT in the Fe IX/X 171Å line. The temperature of this material is about 1 million K in the lower corona. The large loop on the right arches over an active region. The extreme ultraviolet image enables us to see tight, loop-like magnetic fields that extend above the Sun's surface around which charged particles are spinning (27...
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-cds010 - NASA/Solar & Heliospheric Observatory
Active region loops observed on the West limb.
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-las024 - NASA/Solar & Heliospheric Observatory
Bright coronal mass ejection (CME) with an enormous erupting prominence as recorded by the LASCO C2 coronagraph onboard SOHO on 2 June 1998 at 13:31 UT. The prominence eruption is also visible in SOHO EIT images (cf. http://umbra.nascom.nasa.gov/comets/SOHO_sungrazers.html).
Keywords: What -- SOHO
Downloads: 7
[image]SPD-SOHO-eit003 - NASA/Solar & Heliospheric Observatory
No Caption.
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-eit028 - NASA/Solar & Heliospheric Observatory
SOHO-EIT image in resonance lines of eight and nine times ionized iron (Fe IX/X) at 171 Angstroms in the extreme ultraviolet showing the solar corona at a temperature of about 1 million K. This image was recorded on 11 September 1997. It is dominated by two large active region systems, composed of numerous magnetic loops.
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-suncomp - NASA/Solar & Heliospheric Observatory
No Caption.
Keywords: What -- SOHO
Downloads: 7
[image]SPD-SOHO-bigspotfd - NASA/Solar & Heliospheric Observatory
Huge sunspot group -- Active region 9393 as seen by MDI hosted the largest sunspot group observed so far during the current sol Joseph B. Gurman Normal Joseph B. Gurman 1 0 2001-04-11T18:27:00Z 2001-04-11T18:27:00Z 1 NASA GSGC 1 1 9.2511 800x600 0 0 Huge sunspot group -- Active region 9393 as seen by MDI hosted the largest sunspot group observed so far during the current solar cycle. On 30 March 2001, the sunspot area within the group spanned an area more than 13 times the entire surface of the ...
Keywords: What -- SOHO
Downloads: 7
[image]SPD-SOHO-mdi001 - NASA/Solar & Heliospheric Observatory
MDI Single Dopplergram The MDI instrument is designed to observe the line-of-sight motion of the Sun's photosphere, and to produce a velocity image or dopplergram, with the dominant feature being the solar rotation, which appears as a shift from dark to light across the Sun's disk. The dark colors indicate motion toward the observer.
Keywords: What -- SOHO
Downloads: 8
[image]SPD-SOHO-sunspotmdib - NASA/Solar & Heliospheric Observatory
The subsurface structure (sound speed) below a sunspot as derived from Doppler measurements by MDI. Using the technique of time-distance helioseismology, three planes are shown. The surface intensity shows the sunspot with the dark central umbra surrounded by the somewhat brighter, filamentary penumbra. The second plane cuts from the surface to 24000 km deep showing areas of faster sound speed as reddish colors and slower sound speed as bluish colors...
Keywords: What -- SOHO
Downloads: 10
[image]Color Composite of Solar Features - NASA/Jet Propulsion Laboratory (NASA-JPL)
This composite image combines Extreme Ultravoilet Imaging Telescope (EIT)images from three wavelengths(171, 195 and 284 angstrom) into one that reveals solar features unique to each wavelength. Since the EIT images come to us from the spacecraft in black and white, they are color coded for easy identification. For this image, the nearly simultaneous images from May 1998 were each given a color code (red, yellow and blue) and merged into one...
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-cds016 - NASA/Solar & Heliospheric Observatory
Before, during and after - a blinker event in O V (30,000 x 74,000 km). The three images are minutes apart in time.
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-eit023 - NASA/Solar & Heliospheric Observatory
A SOHO-EIT image showing a huge eruptive prominence in the resonance line of singly ionized helium (He II) at 304 Angstroms in the extreme ultraviolet. While the filament was active at least nine hours before this exposure, the eruption started less than three hours before this image was obtained (1997 August 26 at 16:07 UT). The material in the eruptive prominence is at temperatures of 60,000 - 80,000 K, much cooler than surrounding corona, which is typically at temperatures above 1 million K...
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-spotcollage - NASA/Solar & Heliospheric Observatory
Blasting CME -- This LASCO C2 image, taken 8 January 2002, shows a widely spreading coronal mass ejection (CME) shooting billi Joseph B. Gurman Normal Joseph B. Gurman 2 1 2003-04-07T18:42:00Z 2003-04-07T18:42:00Z 1 NASA GSGC 1 1 9.2511 800x600 0 0 Sunspot series -- This was the largest sunspot group of this solar cycle as it moved with the SunÄö_Ñ_¥s rotation. On 30 March 2001, the sunspot area within the group (called active region 9393) extended across an area more than 13 times the diame...
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-cds021 - NASA/Solar & Heliospheric Observatory
The left panel shows a monochromatic image of an eruption above the east limb observed in O V 629 ? on 19 May 1998. Line profiles in three spatial positions, A, B and C, have been marked and are displayed in the panel to the right. The area marked C represents the average disk profile with zero velocity. From the line shifts one can derive the line-of-sight velocity of the emitting plasma.
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-las022 - NASA/Solar & Heliospheric Observatory
LASCO C3 image of the large coronal mass ejection (CME) of 6 May 1998.
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-trico1 - NASA/Solar & Heliospheric Observatory
This composite image combines EIT images from three wavelengths (171Ôø_, 195Ôø_ and 284Ôø_) into one that reveals solar features unique to each wavelength. Since the EIT images come to us from the spacecraft in black and white, they are color coded for easy identification. For this image, the nearly simultaneous images from May 1998 were each given a color code (red, yellow and blue) and merged into one.
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-304time - NASA/Solar & Heliospheric Observatory
A comparison of three images over four years apart illustrates how the level of solar activity has risen from near minimum to near maximum in the Sun's 11-years solar cycle. These images are captured using He II 304 ? emissions showing the solar corona at a temperature of about 60,000 degrees K. Many more sunspots, solar flares, and coronal mass ejections occur during the solar maximum. The increase in activity can be seen in the number of white areas, i.e., indicators of strong magnetic intensi...
Keywords: What -- SOHO
Downloads: 5
[image]SPD-SOHO-las018 - NASA/Solar & Heliospheric Observatory
Large coronal mass ejection (CME) from 6 November 1997 as recorded by the LASCO C2 coronagraph at 12:36 UT.
Keywords: What -- SOHO
Downloads: 6
[image]SPD-SOHO-las021 - NASA/Solar & Heliospheric Observatory
LASCO C3 image of the large coronal mass ejection (CME) of 20 April 1998.
Keywords: What -- SOHO
Downloads: 7
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